// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_AURA_SCOPED_WINDOW_TARGETER_H_
#define UI_AURA_SCOPED_WINDOW_TARGETER_H_

#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "ui/aura/window_observer.h"

namespace ui {
class EventTargeter;
}

namespace aura {

class Window;

// ScopedWindowTargeter is used to temporarily replace the event-targeter for a
// window. Upon construction, it installs a new targeter on the window, and upon
// destruction, it restores the previous event-targeter on the window.
class AURA_EXPORT ScopedWindowTargeter : public WindowObserver {
public:
    ScopedWindowTargeter(Window* window,
        scoped_ptr<ui::EventTargeter> new_targeter);

    ~ScopedWindowTargeter() override;

    ui::EventTargeter* old_targeter()
    {
        return old_targeter_.get();
    }

private:
    // WindowObserver:
    void OnWindowDestroyed(Window* window) override;

    Window* window_;
    scoped_ptr<ui::EventTargeter> old_targeter_;

    DISALLOW_COPY_AND_ASSIGN(ScopedWindowTargeter);
};

} // namespace aura

#endif // UI_AURA_SCOPED_WINDOW_TARGETER_H_
